false alarm
idiomPart offalse
false alarm — idiom
1. A warning about danger that turns out to be unnecessary because there was no act
1.idiom
Definition
A warning about danger that turns out to be unnecessary because there was no actual danger.
Example
The fire alarm went off in the hotel at midnight, but it was a false alarm caused by burnt toast in the kitchen.
Stephanie rushed to the hospital after feeling chest pains, but the doctors said it was a false alarm and sent her home.